Beam-scale.



0. JONES.

BEAM SCALE. APPLICATION FILED NOV. 30,1907.

Patented Oct. 20, 1908.

3 SHEETSSHEET 1.

0. JONES. BEAM SCALE. APPLICATION FILED NOV.30,1907.

Patented Oct. 20, 1908.

3 SHEETS-SHEET 2.

5 w E W 0. JONES.

BEAM SCALE.

APPLICATION IILED N'0v.30,1907.

Patented Oct. 20, 1908.

3 SHEETS-SHEET 3.

Has

OSWALD JONES, OF REDFERN, NEAR SYDNEY, NEW SOUTH WLEQAUSTRALIA.

BEAM-SCALE.

Specification of Letters Patent.

Patented Oct. 20, lacs.

Application filed November 30, 1907. Serial No. 404,495.

To all whom it may concern:

Be it known that I, OSWALD JoNEs, a subj ect of the King of GreatBritain and Ireland, and resident of Redfern, near Sydney, in the Stateof New South Wales, Commonwealth of Australia, have invented new anduseful Improvements in Beam-Scales, of which the following is aspecification.

My invention relates to beam scales and consists in a draft attachmentcoacting therewith which indicates when the overbalancing point is beingapproached and effects the sudden movement of the beam' when therequired weight of goods has been loaded into the pan, whereby exact andrapid weighing of bulk goods such as tea, sugar, coffee or flour isfacilitated.

I am aware that various attachments have been pro osed for the purposeof positively tipping t e beam of a scale when the required weight onthe pan has been reached, so that the result at which I aim is notwholly novel. v

In carrying out my invention, I fit above the middle of the scale beamand supported thereon a tube containing a polished ball capable ofrolling freel along said tube; a support to lift one enc of this tubeoff the weight end of the scale beam while the load is being de ositedin the pan is fitted on the frame; an an adjustable pendular balanceprovided below the beam to regulate the a ance and sensitiveness of it,which would.

otherwise be disturbed by the superposed weight of the tube and ballbefore men tioned. The latter feature may be omitted when the centers'ofthe. beam are so dis osed as to make it balance correctly with thesuperposed weight. In either case the tube fitting is provided with aregulating nut to adjust the balance with precision.

The tube is so mounted that it overloads the pan end of the beam so asto cause the beam to move slightly before the panhas been filled tocorrespond with the weights carried on the weight end of the scale. Thispartial movement of the beam is indicated on a dial by a pointer fixedto the beam and serves to warn the operator that the load in the an iswithin a small fraction of the weig t equired to tip the beam. As afurther quantitf 1s added to the pan the overload is relieved and thebeam moves gradually untilit reaches the intermediate level position.

Instantlythis position is passed the ball rolls along the tube towardsthe load pan, thus causingthe beam to overbalance suddenly anddefinitely. ,Ra-pidity and precision of operation are thus madepossible; exact Weighing is efiected without re uiring withdrawals ofoverweight from the pan and eyesight judgment to determine Whether thebeam has or as not tipped over its center.

Referring to the annexed drawings :Fi' ure 1 is a front elevation of acounter sca e embodying my invention; Fig. 2 top plan of same; Fig. 3end elevation; Fi 4 partial sectional elevation showing in icator anddial; Fig. 5 longitudinal section through the tube, showing ball thereinin act of rolling; Fig. 6 sectional elevation showing in detail themountnig of the tube on the beam; Fi Tend elevatlon of same; Fig. 8corresponding top plan.

The beam and the weight and loadpans and the frame of the scale shown inthe drawings exhibit no feature of novelty;

The beam movement indicator consists of a pointer A attached to the endof the axle of the beam 0 and moving over a dial inclosed in a casing A,A being an adjustable gage to mark the critical balancing point of thebeam.

A is a thumb nut for setting the ga e A B is the balancing tube and C apolished ball of metal capable of rolling freely in said tube B bygravity when off the horizontal in either direction. This tube B iscarried by metallic end covers P and Q. To one of these covers P ascrewed stem D is fixed; it carries a nut d and a jam nut d. These nutsare for adjustment urposes. The

attached to the beam 0, by means of a free working horizontal trunnionpin E which allows the tube B to swing vertically about it withoutfriction.

G is a post fixed on the weight side of the scale beam and provided witha screwed head R by which its height may be adjusted. This post isregulated in height so that when the weight end of the beam is downthere wi l-be a little clearance between the 0st and the rim of thecover P. Under t ose circumstances the left hand end of the tube Hissupported on a roller 'H carried on a very that theweight of the righthand end of the tube B is carried on the Dan end of the beam while itsleft hand end is carried on the frame the beam will ti until the post Gtakes the weight of the tube fromathe roller H, and in tipping throwover the pointer A thereby indicating to the erson using the scale thatthe required weig t in the pan has been approached. Up to this time thetube B has not reached the horizontal position, and the ball C hastherefore lain in its left hand end. The adjusting weights D D and S areso set that the beam just balances at the horizontal when the tube isquite horizontal, so that the slightest downward movement of the loadpan'end of the beam and tube due to the addition of a very slightoverweight will cause the ball C to run towards the load pan by gravity,thereby suddenly overweighting the pan end of the beam and causing thebeam to tip down suddenly. The gage A is set so that the pointer Aregisters with it exactly when the beam and tube lie horizontally andthe load in the pan corresponds exactly with the weight. In view of theweight of the tube and other fittings located over the beam, the axis ofthe same must be set a little higher than ordinarily'so that the fulcrumwill be just above the center of gravity of the moving parts. Thebalance may however be preserved by providing a pendular compensator toset off against the to weight. This compensator consists of a weig t Srunning on a threaded rod T carried by brackets U pendent from the beamor its axle. The rotation of this weight effects its movement along therod T to one side or other depending on the direction of rotation of theweight.

The mode of operation is as follows :-The scale being properly adjustedas already described, the necessary weight is placed in the weight panM, whereby that pan is tipped down, bringing the beam with it andleaving the left hand end of the tube B with the ball in it resting onthe roller H. The goods to be weighed are now teemed gradually into theload pan N. When the necessary weight is being a proached, the beam tipsuntil the post G Rqifts the left hand end of the tube B off the rollerH, the pointer A meanwhile moving off the starting mark on the dial thusindicating to the operator that very little more need be added to theload pan to complete the weight. The necessary quan tity is then addedvery gradually, the beam and ans meanwhile coming to the horizontaposition and the ointer A gradually coming to register with t e gage AImmediately that position is passed, the ball C rolls by gravity alongthe tube B towards the load pan N, and the balance being thus disturbedsuddenly the load pan tips down at once. When the pan is unloaded thebeam is tipped back by the weight in the pan M and it carries the tube Bwith it and causes the ball C to return by gravity to the left han endof the tube, the scale being thus reset for another weighing.

What I claim as my invention and desire to secure by Letters Patent is:

1. A draft attachment for beam scales comprising a tube pivotallymounted on the beam, 2. ball in said tube and actingto tip the beam byrolling under the influence of gravity towards the load pan imnlediatelythe beam has passed a horizontal position, and a carrier on the scaleframe engaging with the tube for preventing said tube from. resting onthe rising end of the beam until the beam is partially tipped.

2. In combination with a beam scale, a tube carrying a rolling ball, apivotal support on the load pan end of the beam for one end of saidtube, a relieving support on the frame for the other end of said tube,and a pillar on the Weight pan end of the beam adapted to lift the tubefrom the relieving support before the beam and the tube have attainedthe horizontal position.

3. The combination with a beam scale, of a tube B carrying a rollinggravity ball 0, a trunnion support I) F on the load pan side of thebeam, a relieving support ll K on the frame for the end of said tubeoverlying the weight an side of the beam, and an adjustable pil ar G Ron the weight Jan side of the beam for taking the weight 0' theoverlying end of the tube off the relieving support H K after the beamhas commenced to cant.

4. The combination with a beam scale fitted with a tube B carrying anoverbah ancing gravity ball, of balance adjustments comprising a movableweight S hung pen dularly below the beam axle and weight nuts (Z d abovethe same on the end of the tube B.

5. The combination of beam (f), tube B, rolling ball C therein, trunnionsupport E F, relieving support H K, pillar support G R, dial, andpointer A mounted on the beam axis.

In testimony whereof l have signed my name to this specification in thepresence of two subscribing witnesses.

OSVALI) JON ES.

Witnesses P. RILEY, W. J. DAVIS.

